JAVAWEB学生信息管理系统保姆级教程(增删改查+登录注册+Filter+mysql)eclipse版_百度小程序

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JAVAWEB学生信息管理系统保姆级教程(增删改查+登录注册+Filter+mysql)eclipse版,第1张

JAVAWEB学生信息管理系统保姆级教程(增删改查+登录注册+Filter+mysql)eclipse版,第2张

Login.css

@charset "UTF-8";
html{   
    width: 100%;   
    height: 100%;   
    overflow: hidden;   
    font-style: sans-serif;   
}   
body{   
    width: 100%;   
    height: 100%;   
    font-family: 'Open Sans',sans-serif;   
    margin: 0;   
    background-color: #808069;   
}   
#login{   
    position: absolute;   
    top: 50%;   
    left:50%;   
    margin: -150px 0 0 -150px;   
    width: 300px;   
    height: 300px;   
}   
#login h1{   
    color: #fff;   
    text-shadow:0 0 10px;   
    letter-spacing: 1px;   
    text-align: center;   
}   
h1{   
    font-size: 2em;   
    margin: 0.67em 0;   
}   
input{   
    width: 278px;   
    height: 18px;   
    margin-bottom: 10px;   
    outline: none;   
    padding: 10px;   
    font-size: 13px;   
    color: #fff;   
    text-shadow:1px 1px 1px;   
    border-top: 1px solid #312E3D;   
    border-left: 1px solid #312E3D;   
    border-right: 1px solid #312E3D;   
    border-bottom: 1px solid #56536A;   
    border-radius: 4px;   
    background-color: #2D2D3F;   
}   
.but{   
    width: 300px;   
    min-height: 20px;   
    display: block;   
    background-color: #4a77d4;   
    border: 1px solid #3762bc;   
    color: #fff;   
    padding: 9px 14px;   
    font-size: 15px;   
    line-height: normal;   
    border-radius: 5px;   
    margin: 0;   
}

Register.css

@charset "UTF-8";
html{   
    width: 100%;   
    height: 100%;   
    overflow: hidden;   
    font-style: sans-serif;   
}   
body{   
    width: 100%;   
    height: 100%;   
    font-family: 'Open Sans',sans-serif;   
    margin: 0;   
    background-color: #808A87;   
}   
#login{   
    position: absolute;   
    top: 50%;   
    left:50%;   
    margin: -150px 0 0 -150px;   
    width: 300px;   
    height: 300px;   
}   
#login h1{   
    color: #fff;   
    text-shadow:0 0 10px;   
    letter-spacing: 1px;   
    text-align: center;   
}   
h1{   
    font-size: 2em;   
    margin: 0.67em 0;   
}   
input{   
    width: 278px;   
    height: 18px;   
    margin-bottom: 10px;   
    outline: none;   
    padding: 10px;   
    font-size: 13px;   
    color: #fff;   
    text-shadow:1px 1px 1px;   
    border-top: 1px solid #312E3D;   
    border-left: 1px solid #312E3D;   
    border-right: 1px solid #312E3D;   
    border-bottom: 1px solid #56536A;   
    border-radius: 4px;   
    background-color: #2D2D3F;   
}   
.but{   
    width: 300px;   
    min-height: 20px;   
    display: block;   
    background-color: #4a77d4;   
    border: 1px solid #3762bc;   
    color: #fff;   
    padding: 9px 14px;   
    font-size: 15px;   
    line-height: normal;   
    border-radius: 5px;   
    margin: 0;   
}

login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>




登陆界面
 


	  
        学生信息管理系统  
          
              
              
              
            
            没有账号请
            注册
            
            
            

            
            	<%
            	String state = (String) session.getAttribute("A2");
            	session.removeAttribute("A2");
            	if(state != null){
            		out.print(state);
            	}
            	%>

register.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>




注册界面



	  
        注册  
          
              
              
              
            
            返回
            登录界面
            
            

            
            	<%
            	String state = (String) session.getAttribute("A1");
            	session.removeAttribute("A1");
            	if(state != null){
            		out.print(state);
            	}
            	%>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ page import="com.bean.StudentBean" %>
    <%@ page import="java.util.*" %>




增删改查界面



	
		
			
				学生信息管理系统
				
		
	
	
		
		
				你好！欢迎${username} 退出
		
	
	
	
		
			
				
				<%
            	ArrayList stuMessage = (ArrayList) session.getAttribute("stuMessage");
            	session.removeAttribute("stuMessage");
            	if(stuMessage != null){
            		
            		for(int i = 0;i < stuMessage.size();i++){
            			StudentBean a = (StudentBean)stuMessage.get(i);
            	%>
            	
            	
            	<%
            		}
            	}
            	%>
				
				
				
					
						
							学号
						
						
							姓名
						
						
							班级
						
						
							年龄
						
						
							专业
						
					
				
				
						
							<%=a.getSid() %>
						
						
							<%=a.getSname() %>
						
						
							<%=a.getScls() %>
						
						
							<%=a.getAge() %>
						
						
							<%=a.getMajor() %>
						
					
			
		
		
			
				
					 学号
					
						
					
				
				
					 姓名
					
						
					
				
				
					 班级
					
						
					
				
				
					 年龄
					
						
					
				
				
					 专业
					
						
					
				
				
					
						 
						 
						 


						 <%
            	String state = (String) session.getAttribute("B2");
            	session.removeAttribute("B2");
            	if(state != null){
            		out.print(state);
            	}
            	%>
						 
					
				
			
			
				
					 学号
					
						
					
				
				
					
						 
						 
						 
						 


						 <%
            	state = (String) session.getAttribute("B1");
            	session.removeAttribute("B1");
            	if(state != null){
            		out.print(state);
            	}
            	%>

学号	姓名	班级	年龄	专业
<%=a.getSid() %>	<%=a.getSname() %>	<%=a.getScls() %>	<%=a.getAge() %>	<%=a.getMajor() %>

StudentBean.java

package com.bean;
public class StudentBean {
	
	private String sid;
	private String sname;
	private String scls;
	private String age;
	private String major;
	public String getSid() {
		return sid;
	}
	public void setSid(String sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getScls() {
		return scls;
	}
	public void setScls(String scls) {
		this.scls = scls;
	}
	public String getAge() {
		return age;
	}
	public void setAge(String age) {
		this.age = age;
	}
	public String getMajor() {
		return major;
	}
	public void setMajor(String major) {
		this.major = major;
	}
}

AdminDao.java

package com.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.util.DBUtil;
public class AdminDao {
	
	//注册
	public static boolean register(String admin,String password) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "insert into auser (admin,password) values(?,?)";
		int a = 0;
		PreparedStatement stm = null; 
		boolean sta = false;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1, admin);
			stm.setString(2, password);
			a = stm.executeUpdate();
			if(a == 0) {
				sta = false;
			}else {
				sta = true;
			}
			
			return sta;
			
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		}	
	}
	//登录
	public static boolean login(String admin,String password) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "select * from auser where admin=? and password=?";
		ResultSet rs;
		PreparedStatement stm = null; 
		boolean sta = false;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1, admin);
			stm.setString(2, password);
			rs = stm.executeQuery();
			if(rs.next()) {
				sta = true;
			}else {
				sta = false;
			}
			
			return sta;
			
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		}	
	}
	
}

StudentDao.java

package com.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import com.bean.StudentBean;
import com.util.DBUtil;
public class StudentDao {
	
	//添加
	public static boolean addStudent(String sid,String sname,String scls,String age,String major) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "INSERT INTO stus VALUES(?,?,?,?,?)";
		int rs;
		PreparedStatement stm = null;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1,sid);
			stm.setString(2,sname);
			stm.setString(3,scls);
			stm.setString(4,age);
			stm.setString(5,major);
			boolean a = false;
			rs = stm.executeUpdate();
			if(rs == 1) {
				return true;
			}else {
				return false;
			}
		}catch (SQLException e) {
			// TODO: handle exception
			e.printStackTrace();
			return false;
		}
	}
	
	//更改
	public static boolean updateStudent(String sid,String sname,String scls,String age,String major) {
		Connection conn = DBUtil.getConnectDb();
		String sql = "UPDATE stus SET sname=?,scls=?,age=?,major=? WHERE sid=?";
		int rs;
		PreparedStatement stm = null;
		try {
			stm = conn.prepareStatement(sql);
			stm.setString(1,sname);
			stm.setString(2,scls);
			stm.setString(3,age);
			stm.setString(4,major);
			stm.setString(5,sid);
			boolean a = false;
			rs = stm.executeUpdate();
			if(rs == 1) {
				return true;
			}else {
				return false;
			}
		}catch (SQLException e) {
			// TODO: handle exception
			e.printStackTrace();
			return false;
		}
	}
	
	//删除
		public static boolean deleteStudent(String sid) {
			Connection conn = DBUtil.getConnectDb();
			String sql = "DELETE FROM stus WHERE sid=?";
			int rs;
			PreparedStatement stm = null;
			try {
				stm = conn.prepareStatement(sql);
				stm.setString(1,sid);
				boolean a = false;
				rs = stm.executeUpdate();
				if(rs == 1) {
					return true;
				}else {
					return false;
				}
			}catch (SQLException e) {
				// TODO: handle exception
				e.printStackTrace();
				return false;
			}
		}
		
		//查询所有信息
		public static ArrayList getList() {
			ArrayList studentArray = new ArrayList();   
			Connection conn = DBUtil.getConnectDb();
			String sql = "SELECT * FROM stus";
			PreparedStatement stm = null;
			ResultSet rs = null;
			
				try {
					stm = conn.prepareStatement(sql);
					rs = stm.executeQuery();
					
					while (rs.next()) {
						StudentBean m = new StudentBean();
						m.setSid(rs.getString("sid"));
						m.setSname(rs.getString("sname"));
						m.setScls(rs.getString("scls"));
						m.setAge(rs.getString("age"));
						m.setMajor(rs.getString("major"));
						studentArray.add(m);
					}
					rs.close();
					stm.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				return studentArray;
		}
		
		//查询单个学生信息
				public static ArrayList getList(String sid) {
					ArrayList studentArray = new ArrayList();   //建立一个数组集合
					Connection conn = DBUtil.getConnectDb();
					String sql = "SELECT * FROM stus WHERE sid=?";
					PreparedStatement stm = null;
					ResultSet rs = null;
					
						try {
							stm = conn.prepareStatement(sql);
							stm.setString(1,sid);
							rs = stm.executeQuery();
							
							while (rs.next()) {
								StudentBean m = new StudentBean();
								m.setSid(rs.getString("sid"));
								m.setSname(rs.getString("sname"));
								m.setScls(rs.getString("scls"));
								m.setAge(rs.getString("age"));
								m.setMajor(rs.getString("major"));
								studentArray.add(m);
							}
							rs.close();
							stm.close();
						} catch (SQLException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
						return studentArray;
				}
}

LoginFilter.java

package com.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebFilter("/*")
public class LoginFilter implements Filter {
	@Override
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletRequest request = (HttpServletRequest)req;
		HttpServletResponse response = (HttpServletResponse)res;
		HttpSession session = request.getSession();
		
		String requestURI = request.getRequestURI();
		System.out.println(requestURI);
		if(requestURI.contains("/login.jsp")
				||requestURI.contains("/LoginServlet")
				||requestURI.contains("/LoginDelete")
				||requestURI.contains("/register.jsp")
				||requestURI.contains("/Login.css")
				||requestURI.contains("/Register.css")
				||requestURI.contains("/RegisterServlet")) {
			chain.doFilter(req, res);
			return;
		}
		
		if(session.getAttribute("username")!=null) {
			chain.doFilter(req, res);
		}else{
			response.sendRedirect("login.jsp");
		}
	}
}

AddStudentServlet.java

package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.StudentDao;
/**
 * Servlet implementation class AddStudentServlet
 */
@WebServlet("/AddStudentServlet")
public class AddStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public AddStudentServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");
		
		String id = request.getParameter("sid");
		String name = request.getParameter("sname");
		String cls = request.getParameter("scls");
		String age = request.getParameter("age");
		String major = request.getParameter("major");
		
		
		boolean a = StudentDao.addStudent(id, name, cls, age, major);
		if(a == true) {
			request.getSession().setAttribute("B2", "添加学生信息成功！");
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}else {
			
			request.getSession().setAttribute("B2", "添加失败，请检查学号！");
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}
		
	}
}

DeleteStudentServlet.java

package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.StudentDao;
/**
 * Servlet implementation class DeleteStudentServlet
 */
@WebServlet("/DeleteStudentServlet")
public class DeleteStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public DeleteStudentServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");
		
		String id = request.getParameter("sid");
		
		boolean a = StudentDao.deleteStudent(id);
		
		if(a == true) {
			request.getSession().setAttribute("B1", "删除学生信息成功！");
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}else {
			
			request.getSession().setAttribute("B1", "删除学生信息失败！");
			
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}
		
	}
}

LoginOut.java

package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * Servlet implementation class LoginOut
 */
@WebServlet("/LoginOut")
public class LoginOut extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginOut() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		request.getSession().invalidate();
		
		response.sendRedirect("/StudentsMessageDemo/login.jsp");
	}
}

LoginServlet.java

package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.dao.AdminDao;
/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");
		
		//获取注册信息
		String username = request.getParameter("u");
		String password = request.getParameter("p");
		
		boolean a = AdminDao.login(username, password);
		
		//登录
		
		if(a == true) {
			HttpSession session = request.getSession();
			//将username保存在session中
			session.setAttribute("username",username);
			
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}else {
			
			request.getSession().setAttribute("A2", "账号或密码错误请重新登录！");
			
			response.sendRedirect("/StudentsMessageDemo/login.jsp");
		}
		
	}
}

RegisterServlet.java

package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.AdminDao;
/**
 * Servlet implementation class RegisterServlet
 */
@WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public RegisterServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");
		
		//获取注册信息
		String username = request.getParameter("u");
		String password = request.getParameter("p");
		
		boolean a = AdminDao.register(username, password);
		
		//将注册信息存入数据库，在返回登录
		
		if(a == true) {
			
			request.getSession().setAttribute("A1", "注册账号成功！");
			response.sendRedirect("/StudentsMessageDemo/register.jsp");
		}else {
			request.getSession().setAttribute("A1", "注册账号失败！");
			response.sendRedirect("/StudentsMessageDemo/register.jsp");
		}
		
	}
}

SelectStudentServlet.java

package com.servlet;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.StudentDao;
/**
 * Servlet implementation class SelectStudentServlet
 */
@WebServlet("/SelectStudentServlet")
public class SelectStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SelectStudentServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");
		
		//获取注册信息
		String id = request.getParameter("sid");
		
		ArrayList a;
		if(id.equals("")) {
			a = StudentDao.getList();
			request.getSession().setAttribute("B1", "查询学生信息成功！");
		}else {
			a = StudentDao.getList(id);
			
		}
		request.getSession().setAttribute("stuMessage", a);
		//System.out.println(a);
		response.sendRedirect("/StudentsMessageDemo/index.jsp");
	}
}

UpdateStudentServlet.java

package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.StudentDao;
/**
 * Servlet implementation class UpdateStudentServlet
 */
@WebServlet("/UpdateStudentServlet")
public class UpdateStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UpdateStudentServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");
		
		//获取注册信息
		String id = request.getParameter("sid");
		String name = request.getParameter("sname");
		String cls = request.getParameter("scls");
		String age = request.getParameter("age");
		String major = request.getParameter("major");
		
		boolean a = StudentDao.updateStudent(id, name, cls, age, major);
		//登录
		
		if(a == true) {
			request.getSession().setAttribute("B2", "修改学生信息成功！");
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}else {
			
			request.getSession().setAttribute("B2", "修改失败，请检查学号！");
			
			response.sendRedirect("/StudentsMessageDemo/index.jsp");
		}
		
	}
}

DBUtil.java

package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBUtil {
	
	public static String url="jdbc:mysql://localhost:3306/students?serverTimezone=UTC&useSSL=true&characterEncoding=utf-8";
	public static String username="root";
	public static String password="";//密码根据自己的自行添加
	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} 
		catch (Exception e) {
			System.out.println(e);
		}
	}
	public static Connection getConnectDb() {
		Connection conn = null;
		try {
			System.out.println("正在连接数据库....");
			conn=DriverManager.getConnection(url,username,password);
			System.out.println("连接成功");
		} 
		catch (SQLException  e) {
			System.out.println(e);
		}
		return conn;
	}
	
}

web.xml



  StudentsMessageDemo
  
    index.html
    index.jsp
    index.htm
    default.html
    default.jsp
    default.htm
  
  

	LoginFilter
	com.filter.LoginFilter


	LoginFilter
	/*

数据库：

JAVAWEB学生信息管理系统保姆级教程(增删改查+登录注册+Filter+mysql)eclipse版,第3张

JAVAWEB学生信息管理系统保姆级教程(增删改查+登录注册+Filter+mysql)eclipse版,第4张

最终效果图：

登陆界面

JAVAWEB学生信息管理系统保姆级教程(增删改查+登录注册+Filter+mysql)eclipse版,第5张

注册界面

JAVAWEB学生信息管理系统保姆级教程(增删改查+登录注册+Filter+mysql)eclipse版,第6张

主界面

JAVAWEB学生信息管理系统保姆级教程(增删改查+登录注册+Filter+mysql)eclipse版,第7张

dw网页制作代码网站建设制作公司地址公司变更地址流程成都网站建设技术支持企业网站怎么注册官网湖南网站设计

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